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RE: HDR Issue / ER Differences

Posted By: Ravi T
Date: Thursday, 15 December 2005, at 4:18 p.m.

In Response To: RE: HDR Issue / ER Differences (Lello, Nick)

Yes, there are big differences between HDR and ER.

HDR is usually implemented as a failover methodology for disaster recovery. Or it is widely used if you would want to use the secondary to handle all the reporting work thus minimizing the load on primary server, and isolating the primary for direct updates, deletes, inserts and such heavy OLTP related DML queries which are business critical. HDR is the best replication method if you do not need update anywhere mechanism which revolves around conflict resolutions methodology for your business.

ER is implemented when a business needs update anywhere mechanism. (like Oracle Streams but better because ER is easier to manage). And, ER allows you to add more instances to the topology as the business grows.

To answer your question in a disaster recovery point of view, ER is better because you would usually have multiple copies of the same database in several locations. However, ER implementation is very costly but the advantages are tremendous. So, ER is sort of like having primary servers everywhere.

HDR on the other hand is one way stream (A>B not B>A) but relatively much easier to manage as opposed to ER and its very inexpensive.

To answer your question about "reliance", all replication methodologies have an internal locking mechanism (some are more complex) to assure that the transactions have been applied to the other counterparts regardless of the method being used. So, had you used ER, still the internal locking is the same but you would have had more avenues for uptime since you would have had at least more than one secondary box.

Now, Informix new versions allow both HDR and ER in the same topology.

My experienced has been that regardless of which methodology being used, if you run a huge transaction in a replicated environment 9 out of 10 it will lock up the systems. For instance, you do not want to create an index on a table consists of 400 million rows that is part of a replicated server without turning off replication first. Also, trying to alter a table with 200 million rows could end up the servers in the same spot if its not done after turning off replication.

Hope these helps.

Ravi.

"Lello, Nick" <Nick.Lello@NielsenEDI.com> wrote: Hi Phil,

In my experience ER works at the transaction level whereas HDR appears
more to apply changes at the chunk level (I am unsure quite how this
works as both use the logical log entries).

Regards,
Nick

-----Original Message-----
From: forum.subscriber@iiug.org [mailto:forum.subscriber@iiug.org] On
Behalf Of Phil Torkington
Sent: Thursday, December 15, 2005 9:23 AM
To: ids@iiug.org
Subject: HDR Issue / ER Differences [6113]

Hi All,

We are running HDR between two informix 9.4FC6 instances on solaris
9....we have just experienced a chronic hardware failure on our
secondary (Sun still trying to find out why - no syslog errors or
diagnostics yet) which caused a long checkpoint followed by a rollback
error (see below) which managed to corrupt two data chunks on our
primary server. IBM tech support dialed in and managed to bring the
chunks online which enabled us to recover the data affected. Tech
Support believe this to be a bug but are still looking into the
diagnostic information.

The real reason for bringing this to the group's attention is to try to
understand if we had been running ER rather than HDR would there be less
chance of suffering a failure on our primary server ? Are there
architectural differences between the two replication methods which
would make the primary server less reliant on whats happening on the
secondary server ?

Thanks in advance

Phil Torkington

Primary Online Log.... (can't get to the secondary one yet ;-) )

09:27:15 Checkpoint Completed: duration was 4 seconds.
09:27:15 Checkpoint loguniq 36786, logpos 0xec558c, timestamp:
0xc18b696e

09:27:15 Maximum server connections 921
09:43:05 DR: ping timeout
09:43:05 DR: Receive error
09:43:05 ASF Echo-Thread Server: asfcode = -25582: oserr = 0: errstr =
: Network connection is broken.

09:43:05 Checkpoint Completed: duration was 650 seconds.
09:43:05 Checkpoint loguniq 36786, logpos 0x1303018, timestamp:
0xc18f9e3d

09:43:05 Maximum server connections 921
09:43:06 Assert Failed: Rollback error 126
09:43:06 IBM Informix Dynamic Server Version 9.40.FC6
09:43:06 Who: Session(721514, ebask13@prdpctb1701.lastminute.com, -1,
1a0e76178)
Thread(766809, sqlexec, 1a1b11388, 4)
File: rstrans.c Line: 2427
09:43:06 Results: Log record (OLDRSAM:HUPDATE) in log 36786, offset
0x1309570 was not rolled back
09:43:06 Action: Use 'onlog' to view the transaction and repair
manually.
09:43:06 stack trace for pid 4211 written to
/temp/informix_dump/af.b7413aa9
09:43:06 See Also: /temp/informix_dump/af.b7413aa9, shmem.b7413aa9.0
09:43:07 DR: Turned off on primary server
09:43:07 DR: Cannot connect to secondary server
09:43:07 Assert Failed: Rollback error 126
09:43:07 IBM Informix Dynamic Server Version 9.40.FC6
09:43:07 Who: Session(721935, ebask13@prdpctb1711.lastminute.com, -1,
19fdac1a8)
Thread(767232, sqlexec, 199ec30c0, 3)
File: rstrans.c Line: 2427
09:43:07 Results: Log record (OLDRSAM:HUPDATE) in log 36786, offset
0x130a030 was not rolled back
09:43:07 Action: Use 'onlog' to view the transaction and repair
manually.
09:43:07 stack trace for pid 4210 written to
/temp/informix_dump/af.b8e83aab
09:43:07 See Also: /temp/informix_dump/af.b8e83aab, shmem.b8e83aab.0
09:43:09 Assert Failed: Rollback error 126
09:43:09 IBM Informix Dynamic Server Version 9.40.FC6
09:43:09 Who: Session(720848, ebask13@prdpctb1801.lastminute.com, -1,
19d749aa8)
Thread(766143, sqlexec, 199ed2570, 1)
File: rstrans.c Line: 2427
09:43:09 Results: Log record (OLDRSAM:HUPDATE) in log 36786, offset
0x13093d0 was not rolled back
09:43:09 Action: Use 'onlog' to view the transaction and repair
manually.
09:43:09 stack trace for pid 4208 written to
/temp/informix_dump/af.b4a73aac
09:43:09 See Also: /temp/informix_dump/af.b4a73aac, shmem.b4a73aac.0
09:47:09 Rollback error 126
09:47:09 Rollback error 126
09:47:09 Rollback error 126
09:47:10 Assert Failed: Rollback error 126 09:47:10 IBM Informix
Dynamic Server Version 9.40.FC6 09:47:10 Assert Failed: Rollback error
126
09:47:10 Who: Session(720848, ebask13@prdpctb1801.lastminute.com, -1,
19d749aa8)
Thread(766143, sqlexec, 199ed2570, 1)
File: rsextlog.c Line: 1643 09:47:10 IBM Informix
Dynamic Server Version 9.40.FC6
09:47:10 Who: Session(721935, ebask13@prdpctb1711.lastminute.com, -1,
19fdac1a8)
Thread(767232, sqlexec, 199ec30c0, 3)
File: rsextlog.c Line: 1643
09:47:10 Results: Log record (OLDRSAM:HUPDATE) in log 36786, offset
0x130a030 was not rolled back
09:47:10 Action: Use 'onlog' to view the transaction and repair
manually.
09:47:10 stack trace for pid 4210 written to
/temp/informix_dump/af.b8e83aab
09:47:10 See Also: /temp/informix_dump/af.b8e83aab
09:47:10 Assert Failed: Rollback error 126 09:47:10 IBM Informix
Dynamic Server Version 9.40.FC6
09:47:10 Who: Session(721514, ebask13@prdpctb1701.lastminute.com, -1,
1a0e76178)
Thread(766809, sqlexec, 1a1b11388, 4)
File: rsextlog.c Line: 1643
09:47:10 Results: Log record (OLDRSAM:HUPDATE) in log 36786, offset
0x1309570 was not rolled back
09:47:10 Action: Use 'onlog' to view the transaction and repair
manually.
09:47:10 stack trace for pid 4211 written to
/temp/informix_dump/af.b7413aa9
09:47:10 See Also: /temp/informix_dump/af.b7413aa9
09:47:10 Results: Log record (OLDRSAM:HUPDATE) in log 36786, offset
0x13093d0 was not rolled back
09:47:10 Action: Use 'onlog' to view the transaction and repair
manually.
09:47:10 stack trace for pid 4208 written to
/temp/informix_dump/af.b4a73aac
09:47:10 See Also: /temp/informix_dump/af.b4a73aac
09:47:30 Rollback error 126
09:47:30 Rollback error 126
09:47:30 Rollback error 126
09:47:31 Assert Failed: Dynamic Server must abort
09:47:31 IBM Informix Dynamic Server Version 9.40.FC6
09:47:31 Who: Session(721514, ebask13@prdpctb1701.lastminute.com, -1,
1a0e76178)
Thread(766809, sqlexec, 1a1b11388, 4)
File: rslog.c Line: 3511
09:47:31 Results: Dynamic Server must abort
09:47:31 Action: Reinitialize shared memory
09:47:31 stack trace for pid 4211 written to
/temp/informix_dump/af.b7413aa9
09:47:31 See Also: /temp/informix_dump/af.b7413aa9
09:47:32 Assert Failed: Dynamic Server must abort
09:47:32 IBM Informix Dynamic Server Version 9.40.FC6
09:47:32 Who: Session(720848, ebask13@prdpctb1801.lastminute.com, -1,
19d749aa8)
Thread(766143, sqlexec, 199ed2570, 1)
File: rslog.c Line: 3511
09:47:32 Results: Dynamic Server must abort
09:47:32 Action: Reinitialize shared memory
09:47:32 stack trace for pid 4208 written to
/temp/informix_dump/af.b4a73aac
09:47:32 See Also: /temp/informix_dump/af.b4a73aac
09:47:32 Assert Failed: Dynamic Server must abort
09:47:32 IBM Informix Dynamic Server Version 9.40.FC6
09:47:32 Who: Session(721935, ebask13@prdpctb1711.lastminute.com, -1,
19fdac1a8)
Thread(767232, sqlexec, 199ec30c0, 3)
File: rslog.c Line: 3511
09:47:32 Results: Dynamic Server must abort
09:47:32 Action: Reinitialize shared memory
09:47:32 stack trace for pid 4210 written to
/temp/informix_dump/af.b8e83aab
09:47:32 See Also: /temp/informix_dump/af.b8e83aab
09:47:51 rslog.c, line 3511, thread 766809, proc id 4211, Dynamic
Server must abort.
09:47:51 rslog.c, line 3511, thread 767232, proc id 4210, Dynamic
Server must abort.
09:47:51 rslog.c, line 3511, thread 766143, proc id 4208, Dynamic
Server must abort.
09:47:52 Fatal error in ADM VP at mt.c:12358
09:47:52 Unexpected virtual processor termination, pid = 4210, exit =
0x100

09:47:53 PANIC: Attempting to bring system down

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Messages In This Thread

HDR Issue / ER Differences
Phil Torkington -- Thursday, 15 December 2005, at 12:23 p.m.
- RE: HDR Issue / ER Differences
  Thirugnanam, Kannan -- Thursday, 15 December 2005, at 2:13 p.m.
- RE: HDR Issue / ER Differences
  Lello, Nick -- Thursday, 15 December 2005, at 2:54 p.m.
  - RE: HDR Issue / ER Differences
    Ravi T -- Thursday, 15 December 2005, at 4:18 p.m.
- Re: HDR Issue / ER Differences
  AJAY GUPTA -- Friday, 16 December 2005, at 2:05 p.m.
- RE: HDR Issue / ER Differences
  Phil Torkington -- Saturday, 17 December 2005, at 1:18 p.m.

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